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RESEARCH ARTICLE (Open Access)

Effects of farming systems, tillage, and traffic practices on deep drainage and soil salt loads in the Queensland Murray–Darling and Fitzroy Basins using soil chloride

D. M. Silburn https://orcid.org/0000-0002-6119-6292 A B * , P. E. Tolmie https://orcid.org/0000-0002-2365-5240 A C , A. J. W. Biggs https://orcid.org/0000-0001-5434-9417 A D and M. H. Crawford https://orcid.org/0000-0001-7661-8470 A
+ Author Affiliations
- Author Affiliations

A Department of Natural Resources and Mines, PO Box 318, Toowoomba, Qld 4350, Australia.

B Centre for Agricultural Engineering, University of Southern Queensland, Toowoomba, Qld 4350, Australia.

C CSIRO Publishing, Locked Bag 10, Clayton South, Vic. 3169, Australia.

D School of Land, Crop and Food Sciences, The University of Queensland, St Lucia, Qld 4072, Australia.


Handling Editor: Gavan McGrath

Soil Research 60(3) 262-278 https://doi.org/10.1071/SR21084
Submitted: 26 March 2021  Accepted: 20 September 2021   Published: 29 November 2021

© 2022 The Author(s) (or their employer(s)). Published by CSIRO Publishing. This is an open access article distributed under the Creative Commons Attribution-NonCommercial-NoDerivatives 4.0 International License (CC BY-NC-ND)

Abstract

Context: Cropping in the Queensland Murray–Darling and Fitzroy Basins has precursors for secondary salinity – high soil salt loads and increased drainage after clearing.

Aims: To measure changes in deep drainage, for key tillage, traffic, and cropping systems.

Methods: Steady-state and transient chloride (Cl) mass-balance were applied to Cl profiles from four tillage and crop rotation trials and one controlled traffic trial in southern and central Queensland, to determine deep drainage below the root zone.

Key results: Large downward movement of Cl occurred after clearing. Deep drainage from transient Cl balance for cropping was a small proportion of rainfall but considerably higher than under native vegetation. Deep drainage was consistently greater under zero than conventional tillage, for both winter and summer cropping. For example, deep drainage was greatest for zero tillage (∼45 mm/year) and least for conventional, stubble mulch, and reduced tillage (2–6.3 mm/year) at the highest-rainfall site (677 mm/year). Deep drainage was 12.7 and 7.9 mm/year for zero and conventional tillage, respectively, at the lowest-rainfall site (497 mm/year). Drainage under continuous wheat conventional tillage was more than twice that where some summer crops were included. At Billa Billa, continuous wheat had greater deep drainage by three to five times than continuous sorghum for three of four tillage systems. No drainage was detected during 6 years of opportunity cropping. A pasture legume ley had only 1.7 mm/year of deep drainage. Deep drainage was less for compacted than non-compacted treatments (23.3 vs 38.2 mm/year).

Conclusion and implications: Increased deep drainage with zero tillage and controlled traffic can be reduced using summer crops, particularly opportunity cropping where crops are planted when soil water is sufficient, and ley pastures.

Keywords: compaction, cracking clay, dryland salinity, native vegetation, opportunity cropping, steady-state mass-balance, transient mass-balance, Vertosols.


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